Preparation method of solvent resistant composite nanofiltration membrane

A composite nanofiltration membrane and solvent-resistant technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of good compatibility of alcohol solvents and low solvent permeation flux, and achieve excellent stability performance, improved charging performance, and high permeation flux

Inactive Publication Date: 2015-12-16
HIT YIXING ACAD OF ENVIRONMENTAL PROTECTION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the nanofiltration membrane prepared by the existing method has good compatibility with alcohol solvents, resulting in too low solvent permeation flux, and to provide a method for preparing a solvent-resistant composite nanofiltration membrane

Method used

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  • Preparation method of solvent resistant composite nanofiltration membrane
  • Preparation method of solvent resistant composite nanofiltration membrane
  • Preparation method of solvent resistant composite nanofiltration membrane

Examples

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Embodiment 1

[0029] Embodiment 1: This embodiment is a preparation method of a solvent-resistant composite nanofiltration membrane, specifically prepared according to the following steps.

[0030] 1. Preparation of ultrafiltration base membrane: firstly, the vacuum-dried polymer polyacrylonitrile was dissolved in dissolved nitrogen methyl pyrrolidone, and a polymer solution with a mass fraction of 18% was prepared.

[0031] Two, using the immersion-precipitation phase inversion method to make a polymer solution with a mass fraction of 18% into an ultrafiltration base membrane;

[0032] 3. Configure a sodium hydroxide solution with a mass concentration of 10% and a hydrochloric acid solution with a concentration of 0.1mol / L;

[0033] 4. Put the polyacrylonitrile-based film in sodium hydroxide solution, and react at 40 degrees Celsius for 30-120 minutes;

[0034] 5. After the reaction is over, put the membrane in deionized water for soaking and cleaning, and then place it in dilute hydrochl...

Embodiment 2

[0043] Example 2: Reference Example 1: The solvent described in step one is N-dimethylformamide, dimethylacetamide or dimethyl sulfoxide.

Embodiment 3

[0044] Embodiment 3: Referring to Embodiment 1 or 2: the mass fraction of aniline in the aniline-ethanol solution described in step 2 is 2% to 15%.

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Abstract

The invention provides a preparation method of a solvent resistant composite nanofiltration membrane, relates to a preparation method of a membrane, and mainly aims at solving the problem that a nanofiltration membrane prepared through an existing method is good in alcohols solvent compatibility, so as to result in a super low solvent permeation flux. The preparation method comprises the steps of 1, preparing an ultrafiltration base membrane; 2, preparing an aniline-ethanol solution; 3, confecting a strong oxidant solution; 4, preparing an ultrafiltration base membrane containing aniline; 5, preparing a solvent resistant composite nanofiltration membrane crude product; 6, performing optimizing process to obtain the solvent resistant composite nanofiltration membrane. The preparation method has the advantages that the prepared solvent resistant composite nanofiltration membrane is a polyaniline / polyacrylonitrile composite nanofiltration membrane taking polyaniline as a selecting layer, the composite nanofiltration membrane has excellent stability in alcohols matters, keeps a relatively high permeation flux and retention rate, and is applicable to a separation system applying alcohols as a medium. The preparation method provided by the invention is mainly used for preparing the solvent resistant composite nanofiltration membrane.

Description

technical field [0001] The invention relates to a method for preparing a film. Background technique [0002] Nanofiltration membrane technology is a new liquid separation technology between ultrafiltration and reverse osmosis, and its development began in the 1980s. Like ultrafiltration and reverse osmosis technology, nanofiltration membrane technology is also a pressure-driven liquid membrane separation process. Since the nanofiltration membrane can pass through various inorganic salts intercepted by the reverse osmosis membrane, but at the same time it can intercept small molecules that can pass through the ultrafiltration membrane, so the emergence of nanofiltration membrane technology fills the gap between the ultrafiltration membrane and the reverse osmosis membrane. Technology gap between permeable membranes. The operating pressure of the nanofiltration membrane is generally between 0.3MPa and 1.5MPa. In this pressure range, the removal rate of multivalent salt ions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/42B01D69/12B01D67/00
Inventor 邵路张聪
Owner HIT YIXING ACAD OF ENVIRONMENTAL PROTECTION
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